Modeling point and non-point nutrient fluxes in river systems of lake Peipsi drainage basi
DOI:
https://doi.org/10.15626/Eco-Tech.2003.047Keywords:
Waste water treatment; Modeling nutrient fluxes; Nutrient source apportionment.Abstract
N and P compounds work as key elements causing bioproduction and eutrophication in
water bodies of the Baltic Sea region, A large-scale dynamic GIS-embedded PolFlow
model considers all point and diffuse emission sources in a river basin simulating also
transport and retention of nutrients in time steps of five years, This modeling approach
was originally developed for simulating past and present nutrient loads for the Rhine and
Elbe rivers. In addition, a statistical model MESAW was employed for nutrient source
apportionment and emission estimations. This paper analysis the modeling results in Lake
Peipsi basin, shared by Estonia, Russia and Latvia, for long-term trends since 1985 till
1999. Results of modeling, as well as monitoring data indicate quite stable long-term P
load while agricultural N load has decreased significantly in connection with dramatic
changes in agricultural structures. That, in turn, has lead to sharp decrease ofN/P ratio in
riverine runoff while in lakes (L Peipsi, L Vortsjii.rv) and coastal seas, NIP ratio has
dropped below 10. These changes, enhancing cyanobacterial blooms, have significantly
worsened the ecological state of these water bodies, in the conditions of decreased
emissions. The paper concludes that wastewater treatment should focus on better removal
ofphosphorus.
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